Cutter head for woodworking machines



April 3, 192s.

R; O. BETTERLEY CUTTER HED FOR WOODWORKING MACHINES 2 Sheets-Sheet l Filed Nov. 5, 1924 Mii " g I "P INVENToR Rolandelfezflgy w T ssEs i nqm t* N /1 MMM N N BY ATTORNEY April 3, 11928.

R. O. BETTERLEY CUTTER HEAD FOR WOODWORKING MACHINES 2 SheetsLSheet 2 Filed Nov. 5. 1924 INVENTOR N Rolandzeer AT'rnNEY Patented pr. 3, 1928.

UNITED STATES PATENT OFFICE.

ROLAND O. BETTERLEY, OF WILLIAMSPORT, PENNSYLVANIA, ASSIGNOR TO HERMANCE' MACHINE COMPANY, OF W'ILLIAMSPORT, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

' CUTTER `HEAD FOR WOODWOR-KING MACHINES.

Application sied November 5, 1924. serial No. 747,943.

This invention relates to a cutter head of the rotary type, designed primarily for attachmentto the arbor of a t'enoning machine or the like, the wood to be operated upon being inoved'transversely of the cutter while the latter rotates.`

One of the objects of the invention is to provide a cutter head with a spur cutter of improved construction and secured in a novel manner for cleaning out the shoulders of the tenons, and which Vmay be used on veneered stock 'without splintering or tearing the veneer.

Another object of the invention is to provide a cutter head of this type witha scoring or grooving bit of improved construction, and having improved means for adjusting the same both longitudinally and radially, and for locking it in its adjusted position.

.:The invention consists further in various details of'constructionl and combinations of elements, the structure and function of which will be more fully explained in the-following detailed description when read in connection` with the accompanying drawings, illustrating Ithe invention in its preferred form. i

. In the drawings.: f Y

Figurel is a perspective view of the improvedcutter head.y Y v Figure 2 is a side elevation thereof.

e Figure 3vis,y a radial section through'one` of thespur cutters, the plane of thesection being indicated at 3 3, Figure2.

Figure 4 is a radial sect-ion throughone of! the scoring or grooving bits. Y

. Figure 5 is a fragmentary view showingv one of the scoring or grooving bits, the view being taken from the side opposite the viewv point of Figure 2. n

Figure 6 is a perspective viewvyof one of theY blocks for holding the scoring or grooving bits. n

Figure 7 is a perspectivevview of a locking pin used in connection with the bloclr shown in Figure 6.

The invention is Vshown in connection with a cylindrical cutter head 10, having a central bore 11 adapted to receive the arbor of a tenoning machine, and having a keyway 12 for securing it thereto. Thehead10 is provided, as usual, with a plurality of equally spaced channels 13, in which are secured cutting-blades 14e 'for forming a tenen.

formed on the opposite face of the block 10. y

The screw 18 passes through a radial slot 21 formed in the outer portion-,of the head 10, and by loosening the screw, the cutter 16 is free to be adjusted outwardly or inwardly. The slot 21 is preferably cut inwardly lfrom the periphery of the head 10, and its outer portion Vformed with opposed under-cut grooves 22 for receiving a cap plate 23, which is secured in position by ak pin 23a. Both the plate 23 and the pin 23al have a close driving tit, so as to be permanentlyassembled in the cutter head. y v

It is to be particularlynoted that the bottom 'of the vchannel 15 is slightly inclined with reference to the aceof the head ,10, so that the cutting spur-16,V when'seated there-1 in, forms a small angle with the face of the' cutter head 10, and with the face ofthe shoulder which it is designed to clean, as shown in Figure 3. The outer face of the spur 16 is formed ywith corrugations 24, and

its outeror cutting edgeeis bevelled, as at 25, so as to form sharp pointed cutting teeth 26. lFhe sides of these cutting teeth are sub'-v stantially equallilre an isosceles triangle, and form equal angles with the center line of the tooth, thus giving the same cutting effect as that of a cross cut saw, while in spurs as heretofore used, the front cutting edge has usually been vertical or .nearly so, approximating the eiect of a rip saw.

` The inclination of the spur cutter to the face of the shoulder results in a smoother Y cut than could be obtained if .it were perpart of the cutting is across the grain of the wood, andfby making them in this shape a smooth cut is assured. In cutting veneered stock, :this construction entirely prevents splinter-ing or tearing of the veneer.

AMounted also on the cutter head l0 between the channels 13 are a plurality of scoring or grooving bits27, each having a cutting edge 28 adapted to cut a groove or chamfer 29, transversely across theface of thewtenon 17. Each b it 27 is mounted on a block 30,*which slidably fits withinl a channel 3l formed across thelouter portion of the head lrOvparal-lel to its-axis. The shape of thechannel 3l is not essential, but it is preferred to make it substantially cylindrical with-a slot S32-connecting it with the-outer Asurface lof thehead 10, through which the The screw 34may be Erotated to adjust the block 30 longitudinally, and is held 'against lateral displacementfby the block itself. For lsecuring the bit 27 to the block 30, a second threaded bore -401is formed therein for receiving a screw 41 which passes through a slot 42 in the bit 27, whereby the latter" may lbe adjusted radially. The bore 40 :preferably Iextends throughout the length ofthe block 30,7s0 that abit 27 mayy be attached to either or both ends of the block. I

The -block 30 is lalso provided with a smooth transverse bore 43, which slidably receives a locking pin 44. formed on its outer end with a rounded face 45forf engagement` with the face ofthe channel 31, yand is formed at-its inner end with a bevelled face 46, which isl engageable by the tapered end 47 of a screw 48 for forcing the pin outwardly to lock the block 30 lin its adjusted position. A threaded bore 49 is formed in the block 30 at right angles to they bore 43 for receiving the screw l48, which actuates the locking pin 44.

In most cases where two pieces of wood are fastenedv together by means-of a mortise andtenon joint, the j tenon is pressed or driven into the inortise.V To facilitate Jthis assembly, it is common practice to bevel the end'Y of the tenon. This bevel is also of great value when the joint is fastened by` gluing, since it prevents the glue from being scraped from the walls of the mortise. It also insures a stronger and better job if an intermediate groove, as shown at y29,

The lattery is i is cut across the face of `the tenori. With the construction above described, the bits may be quickly adjusted both radially and longitudinally to .groove or score the tenon v at the exact length and depth desired. The

bits also cut equally' well. whenused to bevel the end of the tenon, orto forml other shapes at this point-byineans of variously shaped bits. i

While. I have `shown and described the specific details of what is at present re garded as the preferred embodiment, of the invention, itis of course obvious thatthe saine may be modiiied'in various ways withoutsacrificing any of its `essential. features, and it is myy intention, therefore, toinclude.A all such modifications within thescope ofjY the appended claims.. j

What is claimed is: y

1 The 'combination :of a rotary, culi?? toward its axis, said slot having nearesagdsurface undercut faces, a capplatedisposed radial adjustment .at one end of .the.vhead,` a

screw extending longitudinallythrough said# f slot,land means cooperating with said screw for clamping the spur inits adjustedposi tion.A

2. rlhe combination. of a rotary. cutterhead having a longitudinal slot extending sol head having a longitudinall slot extendingk from end to end thereof and extendingfrom the peripheral surface of the headinwardlyf from end'to end ythereof and extendingifromr the peripheral surface of the headinwardly toward its axis, said slot having near said surface undercut faces, a cap=plate disposed between said faces andclosing-thfe fouter side of the slot, a pin permanently securingtlae capplate in position, a cutting spur mounted for radial adjustment at one end of the lhead and slightly inclined 'so that fthespurI proy jects at a slighty inclination Yto the -planepof rotation, a screw extending longitudinally through said slot, means cooperatingfwith said screw for clamping the spur' in its a'djusted position, and .peripheralcuttersexa tending across the surface of .the head whereby to cut a tenon.

3. The combination with a rotary cutter head having parallel radial channels-in opposite faces thereof connected by a longi# 4. The combination with a rotary cutter a plate seated iio iao

head having parallel radial channels in opposite faces thereof connected by a longitudinal slot, of a cutting spur seated in one of said channels and normally projecting beyond the surface of the cutter head, the bottom of said channel being slightly inclined so that the spur projects ata slight inclination to the plane of rotation, a plate seated in the other channel, and a clamping screw extending through said slot parallel to the axis of the head and connecting the spur and plate, said plate, screw and spur being adjustable radially as a unit to vary the distance which the spur projects beyond the surface of the head.

5. The combination of a rotary cutter head having parallel radial channels in opposite faces thereof connected by a longitudinal slot, said slot extending from the peripheral surface of the head inwardly and having near said surface under cut faces, a cap plate disposed between said faces to close the outer side of 'the slot, means for securing the cap plate in position, a cutting spur seated in one of said channels and normally projecting beyond the surface of the head, a plate seated in the other channel, a clamping screw extending through the slot and connecting the spur and plate, said plate,

screwand spur being adjustable as a unit to vary the distance which the spur projects beyond the periphery of the head.

6. The combination of a rotary cutter head having parallel radial channels in opposite faces thereof connected by a longitudinal slot, said slot extending from the outer surface of the head inwardly and having near said surfaces under cut faces, a cap plate disposed between said faces to close the outer side of the slot, a pin permanently securing the cap plate in position, a cutting spur seated in one of said channels and normally projecting beyond the outer surface of the head, the bottom of the channel in which said spur is seated being inclined slightly so that the spur projects at a slight inclination to the plane of rotation, a plate seated in the opposite channehand a clamping screw extending through said slot and connecting the' spur and plate, said plate, screw and spur being adjust-able as a unit to vary the distance which the spur projects beyond the outer surface of the head.

In testimony, that I claim the foregoing as my own, I have hereto affixed my signature.

ROLAND o. BETTERLEY. 

